Fitbit (FIT) exploded for an open-day gain of 48.4 percent on June 18 and that opened the calendar to fitness IPOs. This week has two deals from this sector:Amplify Snack Brands (BETR â proposed) and Planet Fitness (PLNT â proposed) and both are reportedly on everybodyâs âmost wantedâ list. There is more. Last week SoulCyclefiled to go public.